fix(calendar-sync): fix heading order, continuation lines, and exception text cleaningHEADmain

Three bugs found during manual verification of calendar sync output:

1. Heading/timestamp order reversed in event-to-org — nreverse pattern
   put timestamp before the org heading. Swap initial list order.

2. get-property continuation line regex broken — the ^ anchor in
   "^\n[ \t]" prevented matching at the correct position, truncating
   long DESCRIPTION values at the first ICS line fold. Remove anchor,
   add explicit position check (matching get-all-property-lines pattern).

3. collect-recurrence-exceptions didn't clean text — exception instances
   got raw ICS text (literal \n, HTML tags) replacing the cleaned base
   event text. Wrap summary/description/location in clean-text.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/test-calendar-sync--get-property.el b/tests/test-calendar-sync--get-property.el
index 8b71f8e3..20551860 100644
--- a/tests/test-calendar-sync--get-property.el
+++ b/tests/test-calendar-sync--get-property.el
@@ -133,6 +133,26 @@
         (should (equal (calendar-sync--get-property event "DESCRIPTION") "Tasks: setup; review; deploy")))
     (test-calendar-sync--get-property-teardown)))
 
+(ert-deftest test-calendar-sync--get-property-boundary-continuation-lines-joined ()
+  "Test extracting property value with RFC 5545 continuation lines.
+Folded lines start with a space or tab and should be joined."
+  (test-calendar-sync--get-property-setup)
+  (unwind-protect
+      (let ((event "BEGIN:VEVENT\nDESCRIPTION:This is a long\n description that spans\n multiple lines\nSUMMARY:Test\nEND:VEVENT"))
+        (should (equal (calendar-sync--get-property event "DESCRIPTION")
+                       "This is a longdescription that spansmultiple lines")))
+    (test-calendar-sync--get-property-teardown)))
+
+(ert-deftest test-calendar-sync--get-property-boundary-continuation-with-html ()
+  "Test that HTML tags split across continuation lines are fully captured."
+  (test-calendar-sync--get-property-setup)
+  (unwind-protect
+      (let ((event "BEGIN:VEVENT\nDESCRIPTION:Created by <a href=\"https://ex\n ample.com\">link</a> here\nEND:VEVENT"))
+        (let ((value (calendar-sync--get-property event "DESCRIPTION")))
+          (should (string-match-p "example.com" value))
+          (should (string-match-p "</a>" value))))
+    (test-calendar-sync--get-property-teardown)))
+
 ;;; Error Cases
 
 (ert-deftest test-calendar-sync--get-property-error-missing-property-returns-nil ()